Discussion on the problems in the performance insp

2022-08-08
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Discussion on the problems in the performance inspection standards of corrugated boxes and paper drums

there are contradictory problems between the inspection procedures for dangerous goods packaging of cartons and paper drums and the inspection procedures for non dangerous goods packaging

at present, the packaging inspection standards we implement (shipping) are mainly divided into two categories: one is sn0449.2-95 specification for packaging inspection of dangerous goods for export by sea - performance inspection, which is mainly used to inspect the performance of packaging containers of dangerous goods; The other is the standard for performance inspection of non dangerous goods packaging containers. For cartons and cardboard barrels, one is sn/t0262-93 inspection procedures for corrugated boxes for transportation and packaging of export commodities; The other is sn/t0270-93 rules for inspection of cardboard drums for transportation and packaging of export commodities

according to the provisions of "8. Measurement accuracy sn0449.2-95 specification for inspection of packaging of dangerous goods for export by sea - performance inspection" (hereinafter referred to as sn0449.2-95 standard), the dangerous goods they contain are divided into three categories according to the degree of danger:

class I packaging is applicable to highly dangerous goods; Class II packaging is applicable to moderately dangerous goods; Class III packaging is applicable to low-risk goods

according to the dangerous degree of the goods loaded, the performance inspection of the packaging containers requires different products from some foreign manufacturers. The higher the category of dangerous goods, the higher the requirements of packaging performance inspection, that is, the requirements of packaging performance inspection for class I dangerous goods are higher than those for class II dangerous goods. The packaging performance inspection requirements for class II dangerous goods are higher than those for class III dangerous goods. In use, we allow the packaging containers that pass the class I packaging performance test to contain class II and class III dangerous goods. The packaging containers that pass the class II packaging performance test can contain class III dangerous goods, otherwise, it is not allowed. Based on this inference, can we think that the packaging containers that pass the packaging performance test of dangerous goods can certainly contain non dangerous goods? Generally speaking, it is possible. Many of them do this in the process of operation, but in fact, there are some problems from the current inspection standards

in sn0449.2-95 standard, there are two tests for carton performance inspection: drop test and stacking test. For the drop test, five sample boxes with simulators of the specified weight are required to be dropped after constant temperature and humidity treatment. The drop height of class I packaging is 1.8m, class II packaging is 1.2m, and class III packaging is 0.8m. Each sample box is dropped once, and the falling parts are the top surface, bottom surface, long side, short side, short edge or corner respectively. The judgment criterion is that the five sample boxes are not broken after falling, and the contents are not leaked

stacking test: three sample boxes containing simulators of the specified weight are subjected to constant temperature and humidity treatment, and then the stacking test is carried out under the conditions of constant temperature and humidity. The stacking time is 24h. The stacking weight is calculated by the following formula:

m= (XH-1) · M1 where m - stacking weight, unit: kg; X -- Minimum stacking height, 3M; H -- height of single package, i.e. height of carton, unit: m; M1 -- gross weight of single package, that is, gross weight of carton, unit: kg. The judgment criterion is: the three sample boxes are qualified if they are not broken and collapsed. In the sn/t0262 inspection procedures for corrugated boxes for export transportation and packaging (hereinafter referred to as sn/t0262 standard), the drop test requires three sample boxes with the specified weight simulation to be dropped after constant temperature and humidity treatment. The gross weight of the sample box is within the range of 15 ~ 30kg, and the drop height is 0.8m. One sample box falls seven times. Generally, it starts from a certain corner and the three sides and three edges that make up the corner, The judgment criterion is that the three sample boxes are not broken after falling, and the contents are not leaked

stacking test: three sample boxes with specified weight of simulants are stacked under constant temperature and humidity conditions after constant temperature and humidity treatment. The stacking time is 24h. The stacking weight is calculated by the following formula: m=k · (XH) · M1, where m - stacking weight, unit: kg; X -- Minimum stacking height, 3M; H -- height of single package, i.e. height of carton, unit: m; M1 -- gross weight of single package, that is, gross weight of carton, unit: kg; K - deterioration coefficient, see Table 1 for the value

by analyzing the above two standards, it is not difficult to see that the requirements of sn/t0262-93 for the performance inspection of cartons are much higher than those of sn0449.2-95 for the performance inspection of class III packaging cartons of dangerous goods. From the drop test, under the same test conditions and test methods, one carton in sn/0262-93 standard should be dropped seven times, while one carton in sn0449.2-95 standard should be dropped once, and the drop height is the same (for class III packaging)

in the stacking test, the stacking weight formula in sn/t0262-93 standard is one more coefficient K than that in sn0449.2-95 standard, that is, the stacking weight of cartons in sn/t0262-93 standard is k times of the stacking weight of cartons in sn0449.2-95 standard, at least 1.6 times, so we draw a very contradictory conclusion, That is, the performance inspection requirements of cartons containing ordinary goods are much higher than those of cartons containing class III dangerous goods. In other words, cartons containing class III dangerous goods cannot contain ordinary goods. Isn't this a very ridiculous conclusion! This is bound to cause confusion in packaging management

the same situation occurs in the performance inspection of cardboard barrels. In sn0449.2-95 standard, cardboard barrels need to do two tests: drop test and stacking test. Drop test: six sample barrels loaded with simulators of the specified weight shall be dropped after 24h treatment under constant temperature and humidity. The drop height is 0.8m for cardboard barrels loaded with class III dangerous goods, three sample barrels are a group, the bottom corner of the barrel is dropped, and the other three sample barrels are a group, and other weak parts are dropped. The judgment criterion is that all six sample barrels are not broken, and the contents are not spilled and leaked. Stacking test: three sample barrels filled with simulators of the specified weight are stacked after constant temperature and humidity treatment. The stacking time is 24h. The stacking weight is calculated by the following formula:

m= (XH-1) · M1 where m - stacking weight, unit: kg; X -- Minimum stacking height, 3M; H -- height of single package, i.e. height of cardboard barrel, unit: m; M1 -- gross weight of single package, i.e. gross weight of cardboard barrel, unit: kg. Judgment criteria: the three sample barrels are qualified if they do not crack and collapse. In sn/t0270-93 standard, cardboard barrels need to do three tests: drop test, stacking test and shear resistance test

drop test: three sample barrels containing simulators of the specified weight are dropped after 24h of constant temperature and humidity treatment, and each sample barrel is dropped three times, (1) the top and bottom surfaces are dropped; (2) Falling parallel to the axis of the cylinder; (3) Fall of the edge of the barrel (bottom corner of the barrel). The gross weight of the sample barrel is within the range of 15 ~ 30kg, and the drop height is 0.8m. Judgment criteria: it is qualified if the three sample barrels are not broken and the contents are not leaked

stacking test: three sample barrels filled with simulators of the specified weight are stacked after 24h treatment at constant temperature and humidity. The stacking time is 24h. The stacking weight is calculated by the following formula:

m=k · (XH-1) · M1 in the formula, M - stacking weight, the unit is kg; X -- Minimum stacking height, 3M; H -- gross weight of single package, i.e. gross weight of cardboard barrel, unit: kg; M1 -- gross weight of single package, i.e. gross weight of cardboard barrel, unit: kg; K - deterioration coefficient, generally taken as 2

judgment criteria: it is qualified if the three sample barrels do not crack and collapse. Shear resistance test: three sample barrels are treated at constant temperature and humidity for 24 hours, and then the three sample barrels are inverted with the barrel bottom facing up. A thick round board with a diameter of 10mm less than the barrel bottom is placed on the upper plane of the barrel bottom, and the static pressure is added to 5000n for 4 hours

judgment criteria: it is qualified if the barrel bottom does not fall off

compared with the requirements of these two standards for the performance inspection of cardboard barrels, we can draw the same conclusion as the carton inspection, that is, the performance inspection requirements of cardboard barrels loaded with non dangerous goods in sn/t0270-93 standard are much higher than those of cardboard barrels loaded with class III dangerous goods in sn0449.2-95 standard,

because from the drop test, under the same test conditions and methods, each sample barrel of sn0449.2-95 standard falls only once, However, each sample barrel of sn/t0270-93 standard has to fall three times. From the stacking test, under the same test conditions and methods, the stacking formula of sn/0270-93 standard has an additional coefficient K than that of sn0449.2-95 standard, and the value of K is generally 2. In other words, the stacking weight of sn/t0270-93 standard applicable to the performance inspection of cardboard barrels for ordinary goods is twice that of sn0449.2-95 standard applicable to the performance inspection of cardboard barrels for dangerous goods, not to mention that sn/t0270-93 standard adds shear resistance test to the performance inspection of cardboard barrels, which is not specified in sn0449.2-95 standard (by the way, the requirements of shear resistance test are very high)

to sum up, we seem to come to the same conclusion as the carton performance test, that is, cardboard barrels containing class III dangerous goods cannot contain non dangerous goods. Obviously, this is absurd and in fact impracticable. Are all the packaging performance inspection standards for non dangerous goods higher than those for class III dangerous goods? Not necessarily, we can find many such examples, that is, the performance inspection requirements of the packaging containers for class III dangerous goods are not lower than those for non dangerous goods, such as the performance inspection of plastic containers, which will not be detailed here

in a word, taking a comprehensive view of the current performance inspection standards for packaging containers, we can find that some of them are contradictory, confusing and unclear, just as the author cited the two examples above. This makes the inspectors at a loss and brings hidden dangers to the packaging management of export commodities

since the reform and opening up, China's corrugated box industry has developed rapidly, and the growth rate has always been in the forefront among the world's major production countries. According to statistics, from 1995 to 2003, China's corrugated paper production continued to grow. From 1995 to 2001, China's corrugated paper production increased by an average of 1billion m2 per year, with a total increase of 81.4% in seven years and an average annual growth rate of 11.6%, much higher than the world average growth rate

since 1995, China's corrugated paper production has always ranked third in the world, second only to the United States and Japan. In 2002, the output reached 14.8 billion m2, with an increase of 10.3. At the same time, it led the formulation of the national standard "glass fiber filter materials" (gb/t25041 (2) 010), which was approved and released%, surpassing Japan, ranking second in the world and second only to the United States. In 2003, the output was about 15.8 billion m2, an increase of about 6.8%. The continuous increase in output is mainly due to the progress of production technology, process, equipment and management of paper enterprises. With the improvement of domestic medium and high-grade corrugated paper production quality and output, the proportion of imported corrugated paper will be smaller and smaller. It imported 1.254 million tons in 2002 and less than 1 million tons in 2003, indicating that China has achieved self-sufficiency in a large number of medium-grade and some high-grade cardboard products, and only some high-grade Kraft linerboard and high-strength corrugated paper still need to be imported in recent years

after China's entry into WTO, with the transfer of the focus of the world's processing and manufacturing industry to China, the pace of development of China's packaging industry, especially the corrugated box industry, has accelerated. Relevant authorities predict that it has reached 16.537 billion m2 in 2004 and will achieve an annual consumption of 20 billion m2 in the coming years. During the Tenth Five Year Plan period, it is expected that China's paper industry will continue to develop at an 8% growth rate. In 2005, China's annual consumption of paper and paperboard will reach 50million tons, including corrugated paperboard consumption

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